./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e5878b7d2af5fd4b66050c0dbed52215fb6ea8477622dc26391a98be7bc7f1ca --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 11:41:58,127 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 11:41:58,129 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 11:41:58,144 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 11:41:58,145 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 11:41:58,145 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 11:41:58,146 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 11:41:58,147 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 11:41:58,148 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 11:41:58,149 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 11:41:58,150 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 11:41:58,151 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 11:41:58,151 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 11:41:58,152 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 11:41:58,152 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 11:41:58,153 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 11:41:58,154 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 11:41:58,154 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 11:41:58,155 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 11:41:58,157 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 11:41:58,158 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 11:41:58,159 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 11:41:58,159 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 11:41:58,160 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 11:41:58,163 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 11:41:58,163 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 11:41:58,163 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 11:41:58,164 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 11:41:58,164 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 11:41:58,165 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 11:41:58,165 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 11:41:58,165 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 11:41:58,166 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 11:41:58,167 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 11:41:58,167 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 11:41:58,167 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 11:41:58,168 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 11:41:58,168 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 11:41:58,168 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 11:41:58,169 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 11:41:58,169 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 11:41:58,170 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 11:41:58,191 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 11:41:58,191 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 11:41:58,192 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 11:41:58,192 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 11:41:58,192 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 11:41:58,192 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 11:41:58,192 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 11:41:58,192 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 11:41:58,192 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 11:41:58,193 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 11:41:58,193 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 11:41:58,193 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 11:41:58,193 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 11:41:58,193 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 11:41:58,193 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 11:41:58,193 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 11:41:58,193 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 11:41:58,193 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 11:41:58,194 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 11:41:58,194 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 11:41:58,194 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 11:41:58,194 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 11:41:58,194 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 11:41:58,194 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 11:41:58,194 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 11:41:58,194 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 11:41:58,195 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 11:41:58,195 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 11:41:58,195 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 11:41:58,195 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 11:41:58,195 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 11:41:58,195 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 11:41:58,195 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 11:41:58,195 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 11:41:58,195 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 11:41:58,195 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 11:41:58,196 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 11:41:58,196 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 11:41:58,196 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 11:41:58,196 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 11:41:58,196 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 11:41:58,196 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e5878b7d2af5fd4b66050c0dbed52215fb6ea8477622dc26391a98be7bc7f1ca [2022-12-14 11:41:58,393 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 11:41:58,412 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 11:41:58,414 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 11:41:58,415 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 11:41:58,416 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 11:41:58,417 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c [2022-12-14 11:42:01,052 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 11:42:01,221 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 11:42:01,222 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/sv-benchmarks/c/seq-mthreaded/pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c [2022-12-14 11:42:01,227 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/data/e2a4e65aa/16cc6818c7a040ffb855c546730ccc83/FLAG24ac57502 [2022-12-14 11:42:01,238 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/data/e2a4e65aa/16cc6818c7a040ffb855c546730ccc83 [2022-12-14 11:42:01,239 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 11:42:01,241 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 11:42:01,242 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 11:42:01,242 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 11:42:01,245 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 11:42:01,245 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 11:42:01" (1/1) ... [2022-12-14 11:42:01,246 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4985cca6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:42:01, skipping insertion in model container [2022-12-14 11:42:01,246 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 11:42:01" (1/1) ... [2022-12-14 11:42:01,251 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 11:42:01,269 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 11:42:01,429 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/sv-benchmarks/c/seq-mthreaded/pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c[6117,6130] [2022-12-14 11:42:01,433 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 11:42:01,442 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 11:42:01,469 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/sv-benchmarks/c/seq-mthreaded/pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c[6117,6130] [2022-12-14 11:42:01,470 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 11:42:01,480 INFO L208 MainTranslator]: Completed translation [2022-12-14 11:42:01,480 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:42:01 WrapperNode [2022-12-14 11:42:01,480 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 11:42:01,481 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 11:42:01,481 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 11:42:01,482 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 11:42:01,487 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:42:01" (1/1) ... [2022-12-14 11:42:01,494 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:42:01" (1/1) ... [2022-12-14 11:42:01,514 INFO L138 Inliner]: procedures = 23, calls = 14, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 205 [2022-12-14 11:42:01,515 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 11:42:01,515 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 11:42:01,516 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 11:42:01,516 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 11:42:01,524 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:42:01" (1/1) ... [2022-12-14 11:42:01,525 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:42:01" (1/1) ... [2022-12-14 11:42:01,527 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:42:01" (1/1) ... [2022-12-14 11:42:01,527 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:42:01" (1/1) ... [2022-12-14 11:42:01,532 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:42:01" (1/1) ... [2022-12-14 11:42:01,536 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:42:01" (1/1) ... [2022-12-14 11:42:01,538 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:42:01" (1/1) ... [2022-12-14 11:42:01,539 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:42:01" (1/1) ... [2022-12-14 11:42:01,542 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 11:42:01,543 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 11:42:01,543 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 11:42:01,543 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 11:42:01,544 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:42:01" (1/1) ... [2022-12-14 11:42:01,550 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 11:42:01,561 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:42:01,572 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 11:42:01,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 11:42:01,606 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 11:42:01,606 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 11:42:01,606 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 11:42:01,606 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 11:42:01,677 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 11:42:01,679 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 11:42:01,886 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 11:42:02,101 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 11:42:02,102 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-12-14 11:42:02,103 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 11:42:02 BoogieIcfgContainer [2022-12-14 11:42:02,104 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 11:42:02,105 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 11:42:02,105 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 11:42:02,107 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 11:42:02,107 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 11:42:01" (1/3) ... [2022-12-14 11:42:02,108 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31d1a199 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 11:42:02, skipping insertion in model container [2022-12-14 11:42:02,108 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 11:42:01" (2/3) ... [2022-12-14 11:42:02,108 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31d1a199 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 11:42:02, skipping insertion in model container [2022-12-14 11:42:02,108 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 11:42:02" (3/3) ... [2022-12-14 11:42:02,109 INFO L112 eAbstractionObserver]: Analyzing ICFG pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c [2022-12-14 11:42:02,123 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 11:42:02,123 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 11:42:02,157 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 11:42:02,161 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5b4c0755, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 11:42:02,161 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 11:42:02,164 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:42:02,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 11:42:02,169 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:42:02,169 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 11:42:02,169 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:42:02,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:42:02,173 INFO L85 PathProgramCache]: Analyzing trace with hash 1728063573, now seen corresponding path program 1 times [2022-12-14 11:42:02,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:42:02,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134348599] [2022-12-14 11:42:02,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:42:02,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:42:02,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:42:02,903 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:42:02,904 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:42:02,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134348599] [2022-12-14 11:42:02,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2134348599] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:42:02,905 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:42:02,905 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 11:42:02,906 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177306122] [2022-12-14 11:42:02,907 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:42:02,911 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 11:42:02,911 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:42:02,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 11:42:02,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 11:42:02,940 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:42:02,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:42:03,000 INFO L93 Difference]: Finished difference Result 33 states and 48 transitions. [2022-12-14 11:42:03,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 11:42:03,002 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-12-14 11:42:03,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:42:03,008 INFO L225 Difference]: With dead ends: 33 [2022-12-14 11:42:03,008 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 11:42:03,010 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 11:42:03,012 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 11 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:42:03,013 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 19 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:42:03,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 11:42:03,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 13. [2022-12-14 11:42:03,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:42:03,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2022-12-14 11:42:03,038 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 6 [2022-12-14 11:42:03,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:42:03,038 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2022-12-14 11:42:03,038 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:42:03,039 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2022-12-14 11:42:03,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-12-14 11:42:03,039 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:42:03,039 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:42:03,039 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 11:42:03,040 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:42:03,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:42:03,040 INFO L85 PathProgramCache]: Analyzing trace with hash 2056684357, now seen corresponding path program 1 times [2022-12-14 11:42:03,041 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:42:03,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184591238] [2022-12-14 11:42:03,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:42:03,041 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:42:03,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:42:03,252 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:42:03,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:42:03,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184591238] [2022-12-14 11:42:03,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184591238] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:42:03,253 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:42:03,253 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 11:42:03,254 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573722955] [2022-12-14 11:42:03,254 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:42:03,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 11:42:03,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:42:03,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 11:42:03,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 11:42:03,256 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:42:03,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:42:03,289 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2022-12-14 11:42:03,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 11:42:03,289 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-12-14 11:42:03,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:42:03,290 INFO L225 Difference]: With dead ends: 32 [2022-12-14 11:42:03,290 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 11:42:03,291 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 11:42:03,292 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 9 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:42:03,292 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 25 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:42:03,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 11:42:03,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 14. [2022-12-14 11:42:03,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:42:03,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2022-12-14 11:42:03,296 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 8 [2022-12-14 11:42:03,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:42:03,296 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2022-12-14 11:42:03,296 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:42:03,297 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2022-12-14 11:42:03,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-12-14 11:42:03,297 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:42:03,297 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:42:03,297 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 11:42:03,298 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:42:03,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:42:03,298 INFO L85 PathProgramCache]: Analyzing trace with hash 2056922685, now seen corresponding path program 1 times [2022-12-14 11:42:03,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:42:03,299 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1665812847] [2022-12-14 11:42:03,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:42:03,299 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:42:03,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:42:03,609 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:42:03,609 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:42:03,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1665812847] [2022-12-14 11:42:03,610 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1665812847] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:42:03,610 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:42:03,610 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 11:42:03,610 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307998300] [2022-12-14 11:42:03,610 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:42:03,611 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 11:42:03,611 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:42:03,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 11:42:03,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 11:42:03,612 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:42:03,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:42:03,655 INFO L93 Difference]: Finished difference Result 32 states and 39 transitions. [2022-12-14 11:42:03,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 11:42:03,655 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-12-14 11:42:03,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:42:03,655 INFO L225 Difference]: With dead ends: 32 [2022-12-14 11:42:03,656 INFO L226 Difference]: Without dead ends: 22 [2022-12-14 11:42:03,656 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-12-14 11:42:03,657 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 7 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:42:03,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 20 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:42:03,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-12-14 11:42:03,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 15. [2022-12-14 11:42:03,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:42:03,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-12-14 11:42:03,660 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 8 [2022-12-14 11:42:03,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:42:03,660 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-12-14 11:42:03,660 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:42:03,660 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-12-14 11:42:03,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 11:42:03,661 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:42:03,661 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:42:03,661 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-12-14 11:42:03,661 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:42:03,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:42:03,662 INFO L85 PathProgramCache]: Analyzing trace with hash -671956975, now seen corresponding path program 1 times [2022-12-14 11:42:03,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:42:03,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411408800] [2022-12-14 11:42:03,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:42:03,662 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:42:03,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:42:03,767 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:42:03,768 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:42:03,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411408800] [2022-12-14 11:42:03,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411408800] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 11:42:03,768 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 11:42:03,768 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 11:42:03,769 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676903594] [2022-12-14 11:42:03,769 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 11:42:03,769 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 11:42:03,769 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:42:03,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 11:42:03,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 11:42:03,770 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:42:03,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:42:03,850 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2022-12-14 11:42:03,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 11:42:03,850 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-12-14 11:42:03,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:42:03,851 INFO L225 Difference]: With dead ends: 36 [2022-12-14 11:42:03,851 INFO L226 Difference]: Without dead ends: 34 [2022-12-14 11:42:03,851 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2022-12-14 11:42:03,852 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 25 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 11:42:03,852 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 46 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 11:42:03,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-12-14 11:42:03,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 18. [2022-12-14 11:42:03,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 17 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:42:03,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2022-12-14 11:42:03,856 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 9 [2022-12-14 11:42:03,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:42:03,857 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2022-12-14 11:42:03,857 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:42:03,857 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2022-12-14 11:42:03,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 11:42:03,857 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:42:03,857 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:42:03,857 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-12-14 11:42:03,858 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:42:03,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:42:03,858 INFO L85 PathProgramCache]: Analyzing trace with hash 802827331, now seen corresponding path program 1 times [2022-12-14 11:42:03,858 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:42:03,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685648922] [2022-12-14 11:42:03,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:42:03,859 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:42:03,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:42:05,283 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:42:05,283 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:42:05,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685648922] [2022-12-14 11:42:05,283 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1685648922] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:42:05,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1989271683] [2022-12-14 11:42:05,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:42:05,284 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:42:05,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:42:05,285 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:42:05,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 11:42:05,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:42:05,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 39 conjunts are in the unsatisfiable core [2022-12-14 11:42:05,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:42:07,995 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:42:07,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:45:42,056 WARN L233 SmtUtils]: Spent 22.09s on a formula simplification. DAG size of input: 1259 DAG size of output: 756 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 11:45:42,061 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:45:42,062 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1989271683] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:45:42,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [586982477] [2022-12-14 11:45:42,075 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 11:45:42,075 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:45:42,077 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 11:45:42,081 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 11:45:42,081 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 11:48:59,799 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 11:49:02,857 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '396#(and (<= 0 |ULTIMATE.start_main_~c1~0#1|) (not (<= (+ ~st3~0 ~st2~0 ~st1~0) 1)) (<= ~p3~0 0) (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (<= 0 |#NULL.base|) (<= 0 ~mode1~0) (<= |ULTIMATE.start_main_~i2~0#1| 0) (<= |ULTIMATE.start_check_~tmp~1#1| 0) (<= 1 |ULTIMATE.start_init_~tmp~0#1|) (<= ~st2~0 1) (<= 0 ~id1~0) (<= 0 |ULTIMATE.start_main_~i2~0#1|) (<= (+ ~p1_new~0 1) 0) (<= |ULTIMATE.start_init_~tmp~0#1| 1) (<= 0 ~mode3~0) (= (mod |ULTIMATE.start_assert_~arg#1| 256) 0) (<= 1 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start_init_#res#1| 1) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_assert_~arg#1|) (<= ~mode2~0 1) (<= 1 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= ~p1~0 0) (<= ~mode3~0 1) (<= 0 ~p2~0) (<= 0 ~p3~0) (<= 0 ~send2~0) (<= ~id1~0 127) (<= ~st1~0 1) (<= 0 (+ ~p2_new~0 1)) (<= |ULTIMATE.start_assert_~arg#1| 1) (<= (+ ~nomsg~0 1) 0) (<= ~mode1~0 1) (<= (+ ~p2_new~0 1) 0) (<= 1 |ULTIMATE.start_init_#res#1|) (<= |#NULL.base| 0) (<= 0 |ULTIMATE.start_check_~tmp~1#1|) (<= ~id3~0 127) (<= ~st3~0 1) (<= 0 ~id2~0) (<= 0 (+ ~nomsg~0 1)) (<= 0 |ULTIMATE.start_check_#res#1|) (<= ~p2~0 0) (<= 0 ~mode2~0) (<= ~id2~0 127) (<= (+ ~p3_new~0 1) 0) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (<= |ULTIMATE.start_main_~c1~0#1| 0) (<= 0 (+ ~p1_new~0 1)) (<= 0 ~send3~0) (<= 0 ~p1~0) (<= 0 |#StackHeapBarrier|) (<= 0 ~send1~0) (<= |ULTIMATE.start_check_#res#1| 0) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |ULTIMATE.start_assert_#in~arg#1| (ite (= |ULTIMATE.start_main_~c1~0#1| 0) 0 1)))' at error location [2022-12-14 11:49:02,857 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 11:49:02,857 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:49:02,857 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6, 8] total 16 [2022-12-14 11:49:02,857 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989227775] [2022-12-14 11:49:02,857 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:49:02,858 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 11:49:02,858 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:49:02,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 11:49:02,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=506, Unknown=0, NotChecked=0, Total=650 [2022-12-14 11:49:02,859 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:49:13,504 WARN L233 SmtUtils]: Spent 10.01s on a formula simplification. DAG size of input: 817 DAG size of output: 457 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 11:49:16,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:49:16,086 INFO L93 Difference]: Finished difference Result 76 states and 89 transitions. [2022-12-14 11:49:16,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 11:49:16,087 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-12-14 11:49:16,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:49:16,087 INFO L225 Difference]: With dead ends: 76 [2022-12-14 11:49:16,087 INFO L226 Difference]: Without dead ends: 63 [2022-12-14 11:49:16,088 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 39.6s TimeCoverageRelationStatistics Valid=371, Invalid=1111, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 11:49:16,088 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 101 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 11:49:16,088 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [101 Valid, 61 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 11:49:16,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-12-14 11:49:16,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 42. [2022-12-14 11:49:16,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.2439024390243902) internal successors, (51), 41 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:49:16,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 51 transitions. [2022-12-14 11:49:16,102 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 51 transitions. Word has length 14 [2022-12-14 11:49:16,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:49:16,102 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 51 transitions. [2022-12-14 11:49:16,102 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:49:16,102 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 51 transitions. [2022-12-14 11:49:16,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-12-14 11:49:16,102 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:49:16,102 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:49:16,108 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 11:49:16,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:49:16,304 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:49:16,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:49:16,305 INFO L85 PathProgramCache]: Analyzing trace with hash 1962886067, now seen corresponding path program 1 times [2022-12-14 11:49:16,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:49:16,306 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1314757119] [2022-12-14 11:49:16,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:49:16,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:49:16,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:49:16,573 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:49:16,573 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:49:16,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1314757119] [2022-12-14 11:49:16,574 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1314757119] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:49:16,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [31350989] [2022-12-14 11:49:16,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:49:16,574 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:49:16,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:49:16,575 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:49:16,576 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 11:49:16,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:49:16,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 25 conjunts are in the unsatisfiable core [2022-12-14 11:49:16,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:49:17,106 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:49:17,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 11:49:17,679 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:49:17,679 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [31350989] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 11:49:17,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [597386237] [2022-12-14 11:49:17,681 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2022-12-14 11:49:17,681 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 11:49:17,681 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 11:49:17,681 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 11:49:17,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 11:52:39,940 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 11:52:42,601 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '704#(and (<= 0 ~id3~0) (<= 0 (+ ~p3_new~0 1)) (<= 1 |ULTIMATE.start_init_~tmp~0#1|) (<= 0 ~id1~0) (= ~p2~0 0) (<= (+ ~p1_new~0 1) 0) (<= |ULTIMATE.start_init_~tmp~0#1| 1) (= (mod |ULTIMATE.start_assert_~arg#1| 256) 0) (<= 1 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start_init_#res#1| 1) (<= ~mode2~0 1) (<= 1 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 ~st1~0) (= |ULTIMATE.start_main_~i2~0#1| 0) (<= 0 ~st2~0) (<= ~mode3~0 1) (<= 0 ~send2~0) (<= ~id1~0 127) (<= 0 (+ ~p2_new~0 1)) (<= (+ ~nomsg~0 1) 0) (<= ~mode1~0 1) (<= (+ ~p2_new~0 1) 0) (<= 1 |ULTIMATE.start_init_#res#1|) (<= ~id3~0 127) (<= 0 ~id2~0) (= |#NULL.offset| 0) (<= 0 (+ ~nomsg~0 1)) (not (= (+ ~st3~0 ~st2~0 ~st1~0) 1)) (= |ULTIMATE.start_check_~tmp~1#1| |ULTIMATE.start_check_#res#1|) (<= ~id2~0 127) (<= 0 ~st3~0) (not (< (mod ~r1~0 256) 3)) (<= (+ ~p3_new~0 1) 0) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 1) (= |ULTIMATE.start_assert_#in~arg#1| |ULTIMATE.start_assert_~arg#1|) (= |ULTIMATE.start_main_~c1~0#1| |ULTIMATE.start_check_#res#1|) (= ~p3~0 0) (<= 0 (+ ~p1_new~0 1)) (<= 0 ~send3~0) (= ~p1~0 0) (<= 0 |#StackHeapBarrier|) (<= 0 ~send1~0) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 1) (= |#NULL.base| 0) (= |ULTIMATE.start_assert_#in~arg#1| (ite (= |ULTIMATE.start_main_~c1~0#1| 0) 0 1)))' at error location [2022-12-14 11:52:42,601 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 11:52:42,601 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 11:52:42,601 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 8, 8] total 18 [2022-12-14 11:52:42,601 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604062336] [2022-12-14 11:52:42,601 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 11:52:42,602 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 11:52:42,602 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 11:52:42,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 11:52:42,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=584, Unknown=0, NotChecked=0, Total=756 [2022-12-14 11:52:42,603 INFO L87 Difference]: Start difference. First operand 42 states and 51 transitions. Second operand has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:52:43,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 11:52:43,217 INFO L93 Difference]: Finished difference Result 97 states and 114 transitions. [2022-12-14 11:52:43,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 11:52:43,217 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-12-14 11:52:43,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 11:52:43,218 INFO L225 Difference]: With dead ends: 97 [2022-12-14 11:52:43,218 INFO L226 Difference]: Without dead ends: 78 [2022-12-14 11:52:43,218 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 529 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=359, Invalid=1047, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 11:52:43,219 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 89 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 11:52:43,219 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 110 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 11:52:43,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-12-14 11:52:43,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 60. [2022-12-14 11:52:43,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2033898305084745) internal successors, (71), 59 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:52:43,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 71 transitions. [2022-12-14 11:52:43,237 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 71 transitions. Word has length 16 [2022-12-14 11:52:43,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 11:52:43,237 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 71 transitions. [2022-12-14 11:52:43,237 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 11:52:43,237 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 71 transitions. [2022-12-14 11:52:43,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-12-14 11:52:43,237 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 11:52:43,237 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 11:52:43,241 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 11:52:43,438 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:52:43,439 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 11:52:43,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 11:52:43,440 INFO L85 PathProgramCache]: Analyzing trace with hash 1963124395, now seen corresponding path program 1 times [2022-12-14 11:52:43,441 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 11:52:43,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124873486] [2022-12-14 11:52:43,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:52:43,441 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 11:52:43,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:52:44,816 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:52:44,816 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 11:52:44,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124873486] [2022-12-14 11:52:44,816 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1124873486] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 11:52:44,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094540671] [2022-12-14 11:52:44,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 11:52:44,816 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 11:52:44,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 11:52:44,817 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 11:52:44,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9872cf14-481b-4f8c-aefe-be03594184d9/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 11:52:44,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 11:52:44,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 41 conjunts are in the unsatisfiable core [2022-12-14 11:52:44,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 11:52:46,212 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 11:52:46,212 INFO L328 TraceCheckSpWp]: Computing backward predicates...